**7. Bioenergy production from different kinds of wastewaters**

Methanogenic anaerobic digestion is a classical anaerobic bioconversion process that has been practiced for over a century and used in full-scale facilities worldwide. This is a complicated process that involves a mixture of population of microorganisms and several gasses and liquid products, thus strict process control and product purification are required. Biogas production have been demonstrated in numerous studies with great success like can see in the Table 6 (Gavrilescu, 2005).


Table 6. Typical performance of anaerobic reactor used for wastewater treatment (Gavrilescu, 2005)
